ocaml-benchmarks: unexpected disconnect

[kit-ty-kate]

This kind of error seems more common these days:

#13 [ 9/13] RUN git -C opam-repository fetch origin 26770281fa1ea8b13aab979c1dfbd326e9ab512c
#13 73.79 error: RPC failed; curl 92 HTTP/2 stream 0 was not closed cleanly: CANCEL (err 8)
#13 73.79 error: 3198 bytes of body are still expected
#13 73.80 fetch-pack: unexpected disconnect while reading sideband packet
#13 73.80 fatal: early EOF
#13 73.80 fatal: index-pack failed
#13 ERROR: process "/bin/sh -c git -C opam-repository fetch origin $OPAMREPOSHA" did not complete successfully: exit code: 128

i've seen it 3 or 4 times in the past couple of weeks.

Full log: https://bench.ci.dev/_pipeline/job/2024-07-11/173146-ocluster-build-950d57